Biology Exploring Study Set 1

What is the name of the cylindrical contractile elements that are about 1 mm in diameter and which individual skeletal muscle cells are packed with?

What are the Z lines in skeletal muscles composed of?

How deep may loons dive while foraging?

How many skeletal muscles are in a typical human body?

What action causes the shape change in the myosin crossbridge that directly triggers the power stroke in skeletal muscle contraction?

Which of the following is a system of vesicles that wraps around each A band and I band, and stores ions that are used in muscle contractions?

In a skeletal muscle contraction, which of the following undergoes a conformational change when it binds to a specific ion and then uncovers the crossbridge binding site by causing another factor to be moved to the grooves in the actin double helix?

In which ion would a defect in transport have the most direct effect on muscle contraction?

What are the H zones in skeletal muscles composed of?

In a skeletal muscle contraction, which of the following acts to allow the crossbridge cycle to occur when it flows into the cytosol through open ion channels?

What is the name of the cords of connective tissues that connect skeletal muscles to bones?

How many nuclei do skeletal muscle cells have, and what controls them?

What is the region between two adjacent Z lines?

What are the I bands in skeletal muscles composed of?

Which muscle type is found in the walls of body tubes and the cavities of vertebrates, such as blood vessels and the intestines?

What are the A bands in skeletal muscle composed of?

What is the diameter of muscle fibres?

In a skeletal muscle contraction, which neurotransmitter is released at the axon terminal to trigger an action potential in the muscle cell?

In a skeletal muscle contraction, what must be moved to the grooves in the actin double helix to uncover the crossbridge binding site?

Which molecules compose parallel bundles of thick filaments?